<script lang="ts" setup name="XtxCarousel">
import { BannerItem } from '@/types';
import { onMounted, onUnmounted, ref } from 'vue';
// 实验型语法,需要配置在vite.config里面配置reactivityTransform开启子传父设置默认值,不丢失响应式
const {list,autoPlay=true,duration=3000} =defineProps<{
  list:BannerItem[]
  autoPlay?:boolean
  duration?:number
}>()
// const props = defineProps({
//   slides: {
//     type: Array as PropType<BannerItem[]>,
//     required: true,
//   },
//   duration: {
//     type: Number,
//     default: 3000,
//   },
//   autoPlay: {
//     type: Boolean,
//     default: false,
//   },
// })
const active=ref(0)
// 上一张
const prev=()=>{
active.value--
if(active.value<0){
  active.value=list.length-1
} 
}
// 下一张
const next=()=>{
  active.value++
if(active.value>=list.length){
  active.value=0
} 
}
//自动轮播
let times = -1
const start=()=>{
    if(!autoPlay)return
  times=window.setInterval(()=>{
     next()
   },duration)
}
//鼠标经过停止
const stop=()=>{
  clearInterval(times)
}

// 组件挂载时开始定时器
onMounted(()=>{
  start()
})
// 组件销毁时销毁定时器
onUnmounted(()=>{
  stop()
})
</script>

<template>
<!-- @mouseleave="start" @mouseenter="stop" -->
  <div class="xtx-carousel"  @mouseleave="start" @mouseenter="stop" >
    <!-- 图片结构 -->
    <ul class="carousel-body">
      <li class="carousel-item "
       v-for="(item,index) in list"
        :key="item.id" 
        :class="{fade:active===index}">
        <RouterLink :to="item.hrefUrl">
          <img
            :src="item.imgUrl"
          />
        </RouterLink>
      </li>
    </ul>
    <!-- 左右按钮 -->
    <a href="javascript:;" class="carousel-btn prev" @click="prev"
      ><i class="iconfont icon-angle-left"></i
    ></a>
    <a href="javascript:;" class="carousel-btn next" @click="next"
      ><i class="iconfont icon-angle-right"></i
    ></a>
    <!-- 小圆点 -->
    <div class="carousel-indicator">
      <span 
      :class="{active:active===index}" 
      v-for="(item,index) in list" 
      :key="item.id"
      @click="active===index"
      ></span>
      
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
  // 老语法:/deep/,新语法:deep()
  :deep(.carousel-btn.prev) {
  left: 270px!important;
  }
:deep(.carousel-indicator) {
  padding-left: 250px;
  }
}
</style>